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Santorum's wins in Minnesota and Colorado are huge boosts to his momentum, and Romney should be worried. Especially the win in Colorado - what a surprise! Santorum is now tied with Romney in terms of the number of first-place wins in states (both have won three if we don't count the Missouri non-binding primary).

However, Romney still maintains some structural advantages. Other than Maine, the next votes aren't for 20 more days, which will give time for (1) Santorum's momentum to slow down; and (2) Romney to get back on his game. Romney has the funds to battle in Super Tuesday and big states. Also, Romney has won in the only winner-take-all state so far, Florida, which gives him a delegate lead that could become important as we go forward.

Gingrich did not do well last night, but Santorum's wins allow Gingrich to focus on winning in southern states on Super Tuesday instead of the narrative of February being all about Romney.

Romney may still be the front runner, but Santorum's three-way win last night made it a little bit tougher for Romney and a bit more unpredictable for what happens with Gingrich.

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